grass {agricolae} | R Documentation |
Data for Friedman test
Description
Twelve homeowners are selected randomly to participate in an experiment with a plant nursery. Each homeowner is asked to select four fairly identical areas in his yard and to plant four different types of grasses, one in each area.
Usage
data(grass)
Format
A data frame with 48 observations on the following 3 variables.
judge
a numeric vector
trt
a factor with levels
t1
t2
t3
t4
evaluation
a numeric vector
Details
Each of the 12 blocks consists of four fairly identical plots of land, each receiving care of approximately the same degree of skill because the four plots are presumably cared for by the same homeowern.
Source
Book: Practical Nonparametrics Statistics, pag 372.
References
Practical Nonparametrics Statistics. W.J. Conover, 1999
Examples
data(grass)
str(grass)
[Package agricolae version 1.3-7 Index]